You're right in saying that most of us overestimate our abilities... but that includes the persons you mention we should follow!
There is no proof that ANY of the various strategies - whether simple or sophisticated - offer a positive return in the long run. They might also lead to significant losses (except HODL).
I'd also like to add: When it comes to investment educate yourself and always follow your own insight. If you follow others blindly, you're almost guaranteed to incur losses.
ya.ya.yo!